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Kathy,
I recently read an article concerning women who were diagnosed with primary breast tumors ER/PR positive, HER2 negative. When metastasis occurs, many of these metastatic tumors are HER2 positive. In the past, these tumors would have been assumed to be ER/PR positive, HER2 negative. Which means, that the treatment plans may not have been addressed toward HER2 tumors. Many times, the tumors are not readily accessible for biopsy and the HER2 status would remain unknown. I think Bayer (like the aspirin) is developing a test to determine through blood samples the HER2 status.
God Bless You,
ron
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